Improvement in hot-air furnaces



2 Sheets--Sheet2. 6'. WHITE. Hot-Air Furnaces.

Patented Dec:17, 187 .'2.

FIG. 5.

Hole.

AM. PHOTO'L'ITHUGIYAPHIC CU. N-KIOSEORNES PROCESS.)

PATENT .Qrrron.

CYRUS WHITE, OF WEST ROXBURY, MASSACHUSETTS.

IMPROVEMENT IN HOT-AIR FURNACES.

Specification forming part of Letters Patent No. 134,118, dated December17, 1872.

To all whom it may concern:

Be it known that I, CYRUS WHITE, of West Roxbury, in the county ofNorfolk and State of Massachusetts, have invented certain new and usefulImprovements in Heating Apparams; and that the following is a full,clear, and exact description of the same, reference being had to theaccompanying drawing.

This invention consists, first, in the employment of aehamber extendedhorizontally above the furnace and connected therewith, the said chamberbeing provided with transverse inclined pipes, connected with theexternal air and with the outer hot-air chamber of the heatingapparatus, in combinationwith an inner chamber, situated within thepassage or chamber above and connected with the furnace, the said innerchamber being connected, by inclined pipes, with the outer chamber ofthe heating apparatus, as hereinafter more fully set forth. Theinvention further consists in the employment of jet-holes in thefurnace, arranged above the plane of combustion, in combination with atube provided with a flapvalve having outer and inner perforated platesto allow the ingress of external air and prevent the escape of gasesfrom the furnace, as hereinafter set forth. v

In the accompanying drawing my improvements in heating apparatus areillustrated.

In Plate 1, Figure 1 is a side elevation of heating apparatusconstructed and arranged according thereto, with masonry shown insection as surrounding the same; Fig. 2, a transverse vertical sectionin plane of line 00 .r, Fig.

l and Figs. 3 and 4, detail views, to be hereinafter referred to. InPlate 2, Fig. 5 is a central longitudinal vertical section in plane ofline 3 y, Fig. 2, Plate 1; and Fig. 6, a plan view, showing moreparticularly the interior construction and arrangement of the chamber jcommunicating with furnace.

Ain the drawing represents a furnace which, in its severalparts-fire-chamber, ash-pit, 870. ---may be constructed as desired, theconstruction thereof forming no part of the present invention, except,as hereinbefore stated, in the arrangement of a series ofjet-holes abovethe plane of combustion, which will be hereinafter referred to, andtherefore needing no more particular description herein. B, a chamber,made, by preference, of wrought sheet-iron,

and of the form in cross-section, shown more particularly in Fig. 2,Plate 1. 1 This chamber B is located in a horizontal position directlyabove the top (3 of the furnace A, and rests, by its bottom plate a,thereon, said bottom plate a being cut out correspondingly to the upperopen end 0 of the furnace A, making a communication between furnace andchamber B. D, a series of pipes arranged in a vertical inclined positionacross the chamber B, opening out of the same bot-hat the top plate I)and side plates 0, but alternating with each other -that is, the onepipe passing out of the top plate b at one side of the center line ofthe chamber and out of the side plate .upon the other side of saidcenter line, and the next pipe passing out of the top plate 12 at thesame side of the center line of said chamber as the preceding pipepassed out of the side plate, and passing out of the side plate upon thesame side of center line as the preceding one passed out at the topplate, and so on, as before described, for the first one, and then forthe next to that, as before, indefinitely or to the extent desired, andWithin the limits of the chamber, the pipes, as it were, crossing eachother, and

all being closed in their extent through the.

chamber B to the same. These several inclined vertical pipes, where theypass out of the sides of the chamber B, are all extended verticallydownward to a common box or chamber, F, located in a plane beneath thefire-pot furnace, which chamber F, at one end, G, opens into theexternal air. H, a chamber within chamber B, and at upper portionthereof. This chamber H extends the whole length of the chamber B, and,by vertically-inclined pipes.

I, communication is established between the outside of chamber B at itsside plates 0. These pipes I follow the course of the inclined pipes I)hereinbefore referred to, and are, in each instance, directly over thesame, as shown. 1 pipes leading to supplementary chamber H, and making acommunication between it at its upper side and the outside of chamber B.The chamber B, vertical pipes D, and cold-air chamber F are all incasedor surrounded by an outer chamber, J, as shown. L, a door opening intofront end of chamber B; and M, outlet at rear end of chamber B, to beconnected in any suitable manner with the chimney or escape-flue. Thepurpose of the parts above e 134.,RE8

described is to secure the heating of air by the fire of furnace; andfrom the description given it is obvious that the products ofcombustion, in passing to the chimney, pass through the chamber B fromend to end thereof, and thus more or less diffuse themselves thereinabout the inclined pipes D I, supplementary or inner chamber H, heatingthereby the air contained in and supplied to them, respectively, by thecold-air supply-chamber and theouter chamber about chamber B, which, asheated, passes out into the outer chamber J, to be from there conducted, as desired, to any apartment or apartments. At and around theopening 0 of furnace into chamber B there is arranged a series ofjet-holes, f, which holes open into a common passage, g, that, through apipe, h, connects with the cold-air supply or chamber F. By thesejet-holes cold air is supplied to and mingled with the flames, smoke,850., arising from the fire-pot, and causing thereby an increasedcombustion thereof, so that in passing through the chamber B they willimpart a greater amount of heat to the pipes arranged therein. The endof the pipe h for supplying the jetholes f with air is provided with aflap-valve, l, disposed so as to swing between the outer perforatedplate m and the inner inclined perforated plate a, partially'crossingthe pipe h. This flap-valve l prevents, in case of a back ward pressureby the gases in the chamber B, the escape of the gases into the cold-airbox F, as then it would close upon the plate m, allowing at all othertimes the free flow of cold am From the arrangement described of thepipes within the chamber B it is plainly seen that the bottom of thechamber is free to be cleaned at any and all times, there being, infact, no obstruction from front to rear of the chamber.

Having thus described my invention, -I shall state my claims as follows:

1. The chamber B, provided with transverse inclined pipes D D, connectedwith the chambers F and J, and arranged as described, in combinationwith the chamber H and inclined pipes I I, substantially as and for thepurpose set forth.

2. The j'et'h'oles arranged above the plane of combustion of thefurnace, in combination with the tube connecting with the chamber F,flap-valve h, and perforated plates m a, as and for the purpose setforth.

The above specification of my invention signed by me this 23d day ofMarch, A. D.

CYRUS WHITE. Witnesses:

EDWIN W. BROWN, ALBERT W. BROWN.

